<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/react.development.js"></script>
    <script src="../js/react-dom.development.js"></script>
    <script src="../js/babel.min.js"></script>
    <script src="../js/prop-types.js"></script>
</head>

<body>
<div id="test"></div>

<script type="text/babel">

    class Demo extends React.Component{
        
        container = React.createRef()
        container2 = React.createRef()

        render(){
            return(
                <div>
                    <input type="text" ref={this.container}/>
                    <button onClick={this.show}>点我提示左侧数据</button>
                    <input type="text" ref={this.container2} onBlur={this.show2}/>
                </div>
            )
        }
        show=()=>{
            console.log(this.container.current.value);
        }
        show2=()=>{
            console.log(this.container2.current.value);
        }
    }
    ReactDOM.render(<Demo/>,document.getElementById('test'))
</script>
</body>

</html>